Table 2.
Sightings and numbers of gray whales recorded on- and off-transect during aerial surveys off northeast Sakhalin Island, 27 July–18 November 2002
| Survey period | Piltun | Offshore | Extensive | Lunskoye | Total | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km | On | Off | km | On | Off | km | On | Off | km | On | Off | km | On | Off | |
| 27–31 July | 179 | 14/18 | 4/5 | 540 | 7/11 | 8/12 | 1455 | 6/7 | 2/2 | 1166 | 1/4 | 0/0 | 3340 | 28/40 | 14/19 |
| 2 August | 359 | 10/11 | 1/1 | 0 | NS | NS | 0 | NS | NS | 0 | NS | NS | 359 | 10/11 | 1/1 |
| 26 August | 361 | 15/21 | 0/0 | 0 | NS | NS | 0 | NS | NS | 0 | NS | NS | 361 | 15/21 | 0/0 |
| 1–5 September | 359 | 14/18 | 12/16 | 600 | 12/15 | 14/19 | 1448 | 0/0 | 4/6 | 580 | 0/0 | 0/0 | 2986 | 26/33 | 30/41 |
| 30 September | 360 | 9/13 | 0/0 | 540 | 8/12 | 2/2 | 0 | NS | NS | 0 | NS | NS | 899 | 17/25 | 2/2 |
| 9–10 October | 233 | 7/10 | 3/71 | 119 | 8/12 | 4/7 | 1213 | 3/7 | 1/2 | 580 | 0/0 | 0/0 | 2144 | 18/29 | 6/10 |
| 6–8 November | 624 | 15/18 | 5/18 | 482 | 1/1 | 1/1 | 680 | 2/5 | 0/0 | 0 | NS | NS | 1786 | 18/24 | 6/9 |
| 15–18 November | 90 | 3/5 | 0/0 | 536 | 12/16 | 5/12 | 353 | 0/0 | 0/0 | 572 | 0/0 | 0/0 | 1551 | 15/21 | 5/12 |
| Total | 2566 | 87/114 | 23/31 | 2817 | 48/67 | 34/53 | 5148 | 11/19 | 7/10 | 2898 | 1/4 | 0/0 | 13428 | 147/204 | 64/94 |
NS Not surveyed